<!DOCTYPE html>
<svg>
  <rect width="100" height="100" fill="red"/>
  <use href="#foo"/>
  <defs>
    <g id="foo">
      <rect width="50" height="100" fill="green"/>
      <script>
        // Force a layout so that the shadow tree is instantiated.
      	document.documentElement.offsetTop;
      </script>
      <rect x="50" width="50" height="100" fill="green"/>
    </g>
  </defs>
</svg>
